Microsquirt damaged?

[1966socalgoat]

I need some advice here, i had my setup running well, tuning the VE table and screwed up. I had my car triggering off the coil + using Optoin-, i screwed up and mistakenly attached Optoin+ to the tach signal on the hei cap (don't ask me why..brain fart). I cant get the car to idle as the rpm signal is spiking everywhere. Once i figured my mistake, i disconnected the Optoin+ from the tach but now the car will not start, engine cranks, will start momentarily with starter fluid but that's it.

Checked fuses nothing is blown.
the setup is a v3 microsquirt running fuel only on a 1966 GTO, with an HEI only. I have had to replace a resistor in the microsquirt before, could it be blown again?

[1966socalgoat]

I had an issue with the R20 resistor before and checked it out. It is ok, does anyone know what else could be damaged, no visible damage on the board

[Matt Cramer]

What exactly are Opto In + and Opto In - wired to right now?

[1966socalgoat]

I went back to how I had it previously, Opto is disconnected, Opto is connected to coil positive. I checked all fuses, fuel pump, fuel injectors, ecu, all were ok

[Matt Cramer]

You need both of these connected to work. Connect Opto In + to the coil negative.

[1966socalgoat]

Thx Matt, all is fine after I rehooked all wires, I am going to change how i get the tach signal I am having issues with the coil negative giving a stable output

[Matt Cramer]

Try wiring the VR sensor in the HEI distributor to the MicroSquirt VR conditioner instead (in parallel with the HEI module).